The Studies Of The Permian Integrated Seismic And Geologic In The Northwest Sichuan Basin

Western Sichuan foreland basin has always been the hot spot of the oil and gasexploration, has good research prospect but complicated geological conditions innorthern Sichuan region, the reservoir distribution forecasting is difficult, Permianburial depth, the research degree is extremely low, many regions still blank in theresearch of earthquake, thrust belt exposed by the Permian areas also found a gooddolomite reservoir section, reveals the great exploration prospects in this area;Therefore to the structure characteristics of the Permian in northern Sichuan regionheavy product system and the favorable trap optimization system research hasimportant significance for oil and gas exploration combining previous research results,this study in the western Sichuan seismic survey line in the northern horizon andtectonic form explanation, on the basis of carried out the structural feature andstructural evolution analysis, by means of seismic facies analysis, and combineddrilling lithology data in the study area, on the basis of in-depth study of sedimentaryfacies, the distribution of the favorable exploration zones in the studied area isforecasted through the research, obtains the following results and understanding:1.On the basis of fine horizon calibration Completed the top boundary of Permianchangxing group Wu Guping top mouth MAO group top top four horizon of qixiagroup of district shall explain the fine depict different embedded depth of the structureof the state and the fault distribution characteristics on the basis of seismic horizoninterpretation, through the deep transformation made Permian MAO mouth topchangxing group structure chart, have certain inheritance, reflect the constructionplane is now two long clip a concave structure, tectonic characteristic local madeobviously controlled by fracture structure is very similar to, or fault block traps withthe faults gradually from the south to the north elevation, structure amplitude isgradually reduced from north to south Western Sichuan foreland basin has always been the hot spot of the oil and gas exploration, has good research prospect butcomplicated geological conditions in northern Sichuan region, the reservoirdistribution forecasting is difficult, Permian burial depth, the research degree isextremely low, many regions still blank in the research of earthquake, thrust beltexposed by the Permian areas also found a good dolomite reservoir section, revealsthe great exploration prospects in this area; Therefore to the structure characteristicsof the Permian in northern Sichuan region heavy product system and the favorabletrap optimization system research has important significance for oil and gasexploration combining previous research results, this study in the western Sichuanseismic survey line in the northern horizon and tectonic form explanation, on the basisof carried out the structural feature and structural evolution analysis, by means ofseismic facies analysis, and combined drilling lithology data in the study area, on thebasis of in-depth study of sedimentary facies, the distribution of the favorableexploration zones in the studied area is forecasted through the research, obtains thefollowing results and understanding:1.Fine horizon calibration based on the top boundary of the Permian ChangxingFormation, the top boundary Wujiaping Maokou top boundary of the top boundary ofthe Qixia four layers region contiguous to explain. Fine portrait of the depth of thestructure of the different layers of state and fault distribution characteristics. Seismichorizons interpreted on the basis of the through-depth conversion produced thePermian Maokou top, the top of the Changxing Formation structure map reflects thestructure has a certain inheritance, the plane is rendered on "two Long foldersconcave" the pattern of structural characteristics are very similar. Significantlyaffected by local tectonic faults control, trap or fault block and rises gradually fromsouth to north with the fault structure amplitude from north to south decreasingfracture development.2. Through a comprehensive analysis on the basis of seismic facies andsedimentary facies of the the northwest Sichuan Permian sedimentary environmentand deposition phase is formed in the backdrop of a large-scale transgression toregression carbonate-clastic rock deposition, affected by the the west side Kangdianancient land and tensile taphrogenesis the depositional environment and there aresome differences. Among them, the Yangsan and Wuchiapingian is carried out on thebasis of the formation of the peneplain after the Caledonian orogeny, overall part of alarge carbonate ramp depositional environment;4:00Mao and Changhsingian tensioncrack movement, resulting in region carbonate ramp quickly transformed to the remote steepening carbonate platform.3. A comprehensive study on the the northwest Sichuan Permian tectonic,sedimentary characteristics, combined with regional data pointed the JiulongMountain tectonic zone, the favorable zones of the platform margin reef and westernSichuan northern region piedmont off with three favorable exploration zones, andproposed Jiulong Mountain anticline traps, the Kowloon Shanxi traps, fish1Well No.2East traps exploration targets.